Elevator-door lock



April 2z 1924. 1,491,449

F. D. WHEELER v ELEVATOR DOOR LOCK Filed D30. 29 1919 2 Sheets-Sheet l April 22, 1924. f 1,491,449

F. D. WHEELER ELEVATOR DOOR LOCK Filed Dec. 29, 1919 2 sheets-sheet 2 @Hornung Patented pr. 22, 1924.

UNITED STATES PATENTv OFFICE.A

FRANK D. WHEELER, O'F /DETBOIT, MICHIGAN, AS-SIGNOR. '10 THE HAUGHTON ELE- VATOB MACHINECOMPANY, F TOLEDO, OHIO.

ELEvAToaDoon Loox.

Application filed December 29, 1919. Serial No. 347,941.

To all whom z't may concer/n:

Be it known -that I, FRANK D. WHnEnER, a citizen of the United States of America,

i residing at Detroit, Wayne County, Michigan, have invented a new and useful Elevator-Door Lock, of which the following is a specification.

This invention relates to safety devices in connection withl power apparatus.,

This invention has utility when incorporated as an electric interlock for landing doors of elevators.

Referring to the drawings:

Fig. 1 is a Wiring diagram of an embodiment of the invention in connection with an alternating current motor driven elevator;

Fig. 2 is a detail view of one of the landing doors of the elevator with the Asafety device of this invention incorporated therewith, the door being shown in open position.;

Fig. 3 is a perspective viewv of the lock and its key;

Fig. 4 is a bottom plan view of the lock with the cover` renioved; and

FFig. 5 is a section on the line V-V,

1g 4. Eilevator shaft 1 is provided with a plurality of landings 2 for elevator car 3 normally operable by cable 4 extending to counterweight 5. This elevator may be driven by an electric motor 6, the operation of which is determined by a controller `7 in the car 3 through control lines from main switch 8 and up switch 9 and down switch 10 receiving supply of power current from power lines 11, 12, 13. From the power line 13 extends branch line 14 through safety devices including the invention of this disclosure herein shown' as terminals 15 through contacts 1'6 as a bridge to terminals 17 at each landing. Accordingly, when this terminal 16 is closing the connection between the contacts 15, 17, this safety device switch lis closed and line 14 may be effective for energizing the main switch 8 when the controller 7 is shifted.

This switch contact 16 is herein spaced by insulation 18 (Fig. 4)v from drum 19 having a key hole or slot 20 therein. This drum 19 is fastened by screw 21 in position y and may have a torsion-spring 22 in a recess 23 (Fig. 5) in the bottom thereof normally ur ing this member toward open position with the contact 16 vagainst fixed stop 24. The respective terminals are normally urged by compression helical 25 toward the drum 19 but are precluded from contacting such drum by keys 26.

These terminals 15, 17, are mounted in terminal blocks 27 carrying `terminal screws 28 to which may be connected line-wire 14 in its coming into and going from lock 'or box 29 through an end opening and con` The terminal blocks 27 are \mounted -on insulation block 31 Ain the housingv 29. The

plate o r .cover 32 having thereon projectlng guide portions 33 as directing means for head 34 of locking bar or key 35, carried by guides 36, for rotation as to its mounting on door 37 at a landin 2 of v.shaft 1 Accordingly, this landing oor 37 1n movln toward closed position at landing `2 of sha t 1 on its hinges 38 has its head 34 of the key of the lockbolt 35 ride into the guide ways 33 for entrance into the lock of the housing 29. .An upward push of this bar 35 into the lock 29 inserts this bar 35 into the key-hole-20 of drum 19. A rotation of the bar 35 to change the direction of its projecting handle from a straight lock housing or box 29 is provided-with a out position to a positionvin parallel with 'I the door throws the drum 19 a .ninety degree turn to bring its contact 16 into enga ement with the pair of terminals 15, 17 t ereby closing this'switch of the safety device to permit, when the door ofthe landingy is closed, an operation of the controller 7 .in the elevator car 3 so that this car may be actuated by motor.6. With any landing .door 37 open, its switch contact 16 would key thus inserted, swings the drum 19 to` bring contact v16 between` theterminals 15, 17. The operator in the car 3, may now shift the controller 7 to the left, swinging 'the terminal carrying lower portion thereof to theright. There, results first an energizing of the main switch 8, and then of the direction switch 9, when the brake is v naaaaae released and the motor 6 operates to cause the car 3 to travel upward. As the next landing ordesired landing for a stop is reached, the controller 7 is swung to central or neutral position, at once` de-energizing switches 8, 9, allowing the brake to set and the motor 6 to be held in stopped position. The operator then swings the key or bar 35 at such floor landing door, so that the key may slide down out of the lock. The rotation of the key before droping downward, turns the drum 19 to. open ine 14. to the'main switch 9, because vcontact` 16 has been moved away from the terminals 15, 17. Withthis break in the circuit to the main switch 9, all attempt to shift the car 3 by operation of the controller 7 'is futile. locking key and bolt 35 in dropped or door unlocking position, the door 37 may be swung open on its hingesS, for takin on a load or taking oil a load at such lan ing.

What is claimed and it is desired to secure by Letters Patent is:

1. A power drive apparatus, a control "therefor, a door, a lock for' the door, a housing for the lock, a switch in the housing to preclude control operation when the door isy open, and means independent of the housing carriedbythe door and manually movable to enter the housing when the door is closed and then movable to operate ythe switch` to render said control operative, said means in position for operating the switch being held by the housing against direct removal therefrom.

v2. A power drive apparatus, a control therefor, a door, a lockfor the door, a housing for the lock,l and 'a key bolt for the lock independent of the housin carried by the door, and manually operab e for withy drawal from the housing to permit opening of 4the door, said key bolt in its operation for withdrawal rendering the control'inefective. said housing being providedv with means holding the bolt from direct removal therefrom when the bolt is in position to render the control eiiective.

k3. An elevator, an electric motor drive therefor, a' controller for the elevator, a shaft in which the elevator is movable, landings along said shaft, a landing door at one of said landings, a lock for the door, a housing for the lock, a key exterior'of the housing operable when the door is closed to enter the housing to lock the door, and a switch for the controller located in said housing and coacting when `Vclosed to hold the key from withdrawal from the housing.

4. An elevator shaft having landings. an elevator .movable in said shaft. landing doors, driving means` for the elevator, a control for the driving means, 'a lock for a landing door, a housing for the lock, and means exterior of the housing operable to With the. combined door enter the housing only at closed position kof the door to ermit the control to become effective, said ousing holding the means from direct removal when the means is in position'to permit the control to become e'ective.

5. An elevator shaft having a landing, a door at said landing, an elevator in the shaft movable to said landing, a power drive for the elevator,y an electric control .for the drive, a lock for the landing door e'eotive for locking independently ot the position of the elevator, said lock including a switch for the control, a housing for the lock and switch, and a rotatable key eX- terior of the housing operable to enter the housing and there rotatable to operate said switch. 1

6. An elevator shaft having a plurality of landings, a door at each landing, an elevatorl in the shaft, van electric drive 'for moving the elevator between the landings, a controller on the elevator, a control line therefrom for the drive, a lock for each landing door eHective for locking independently of the position of the elevator,

each lock including a switch in the control line, a housing for each lock vand switch, and a rotatable key for each door exterior of the housing reciprocable thereinto to lock the door and there rotatable to close the switch.

An elevator shaft having a plurality Lof landings, a door at each landing, an elevator in the shaft, anv electric drive for movingthe elevator between the landings. an electric control line vfor the drive, a lock for each 'landin door, effective for locking independenty of the position-oic the elevator, each lock including a switch in thefcontrl line, a reciprocable and rotatable locking bolt key carried by each door, said key reciprocable yto door locking position and there rotatable to switch closing position, and a controller to which said control line extends and which controller is rendered effective for actuating the drive 9. Ain elevator landing door interlock device embodying a houslng, a key bolt for the housing registering for entering the housing at closed position of the door. and a switch in the housing closed by rotation of the bolt'away from housing' entering position.'

In witness whereof I aix my signature.

FRANK D. WHEELER. 

